摘要:
A process for coating a substrate with an essentially colorless radiation curable composition which comprises coating said substrate with a visible light sensitive composition comprising a free radical addition polymerizable or crosslinkable material and a photobleachable ionic dye-counter ion compound capable of absorbing visible light and generating free radicals; exposing said composition to light to harden said composition; and bleaching said composition to an essentially colorless state, and photohardenable compositions containing photobleachable ionic dye-counter ion compounds as photoinitiators useful in the aforesaid process.
摘要:
A photohardenable composition comprising a free radical addition polyermizable or crosslinkable compound and a cationic dye-borate anion complex, said complex being capable of absorbing actinic radiation and producing free radicals which initiate free radical polymerization of crosslinking of said compound; and photosensitive materials employing the composition where in one embodiment the composition is microencapsulated.